tree 8505c2429b204e799caa045bcb805e70e6e2ea87
parent 9f30b38d74990286ce27c3a45368f73dbe3638f0
author Shih-wei Liao <sliao@google.com> 1314607507 -0700
committer Shih-wei Liao <sliao@google.com> 1314647991 -0700

Add StackVisitor, CountStackDepthVisitor, BuildStackTraceVisitor for EH.

In addition to EH, GC can use StackVisitor too.

Crawl stack in 2 passes, using CountStackDepthVisitor and
BuildStackTraceVisitor, respectively. Note that Pass 1 computes
the depth with a doubly-nested loop.

Change-Id: If1e3d3212037426b10ac5e6a01138acfab710e6b